Update docs/configuring-playbook-bridge-mautrix-bridges.md: edit an instruction

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-bridge-mautrix-bridges.md

@@ -141,7 +141,7 @@ If you run into trouble, check the [Troubleshooting](#troubleshooting) section b
 
 To set up [Double Puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html) enable the [Appservice Double Puppet](configuring-playbook-appservice-double-puppet.md) service for this playbook.
 
-The bridge automatically performs Double Puppeting if [Shared Secret Auth](configuring-playbook-shared-secret-auth.md) is configured and enabled on the server for this playbook by adding
+The bridge automatically performs Double Puppeting if [Shared Secret Auth](configuring-playbook-shared-secret-auth.md) is configured and enabled on the server for this playbook by adding the following configuration to your `inventory/host_vars/matrix.example.com/vars.yml` file:
 
 ```yaml
 matrix_appservice_double_puppet_enabled: true